can my 400w power supply run gtx 750 ti?

subhashr2k · Apr 28, 2016

i have a 400w power supply and i want to install zotac gtx 70ti on my pc . i wanted to know will it work properly on my pc?

ar2uro · Apr 28, 2016

750ti needs minimum of 300w so you should be fine!

turkey3_scratch · Apr 28, 2016

Depends on what unit it is. What unit?

subhashr2k · Apr 28, 2016

turkey3_scratch :

unit means?

turkey3_scratch · Apr 28, 2016

subhashr2k :

The model.

Onus · Apr 28, 2016

Unless it is a PSU-shaped object with a liar-label on it (e.g. actually capable of <200W), you'll be fine. A GTX750Ti needs only around 61W running flat out.

engineer5261 · Apr 28, 2016

It should be fine, unless you have some really crazy stuff being powered off your 400W psu. Just use an online psu calculator and it will work out your entire load.

turkey3_scratch · Apr 28, 2016

engineer5261 :

PSU calculators should not be used, they are very inaccurate and referred to as "random number generators" even by some who despise them even more than I do. Also, even if they were accurate, you can't just go off labelled wattage of a PSU for determining anything. Anybody can slap a number on a box, but what's inside the box is what's important.

subhashr2k · Apr 28, 2016

turkey3_scratch :

engineer5261 :

PSU calculators should not be used, they are very inaccurate and referred to as "random number generators" even by some who despise them even more than I do. Also, even if they were accurate, you can't just go off labelled wattage of a PSU for determining anything. Anybody can slap a number on a box, but what's inside the box is what's important.

the model is circle model no:cph696

turkey3_scratch · Apr 28, 2016

Uhh I can't even find that thing about it online. We cannot guarantee it'll work. I'd advise you to purchase a higher quality unit, others will say, "Well, it's just a 750Ti that's like a 75W GPU". Well those 75W can be a big deal.

It is a gamble, use at your own risk, do what you want with it.

As Onus says, it's probably some PSU-shaped object.

engineer5261 · Apr 28, 2016

turkey3_scratch :

I feel that it is the easiest way for him to figure out an estimated power requirement without using DMM's. If you have a better way of estimating his free power overhead then i'm all ears.

turkey3_scratch · Apr 28, 2016

engineer5261 :

Digital multimeters measure voltage. To calculate the power requirement of his computer, you just know stuff off the back of your head. For CPU and GPU, you look up professional reviews and see stress test power requirements of that hardware. RAM is negligible. Hard drives are about 10W each, SSDs much lower. Basically, it's primarily important to take into account the CPU and GPU, then add perhaps another 50W for the rest of the hardware.

But even then, it should be taken with a grain of salt, because the requirements of the specific rails matter more, as well as the fact that there are many 550W power supplies out there that can maintain stable voltages, not burn, and not shut off from protections when the power of the energy outputs is as high as 650W, whereas there are "750W" units out there that'll have unstable voltage or shut off by time the power of the energy outputs is 650W.

subhashr2k · Apr 28, 2016

turkey3_scratch :

this is the image of the power suppy......

Onus · Apr 28, 2016

I used to run an i5-3570K and a HD7750; they used 126W under gaming loads. A GTX750Ti uses maybe 5W less than the HD7750. That PSU would have to be truly horrendous to be insufficient. Whether or not replacing it is advisable on general principles (PSU-shaped objects tend to die without a clear cause, sometimes violently, and may take attached parts with them into the fiery abyss), I doubt that the 61W load of a GTX750Ti is going to make the difference.

turkey3_scratch · Apr 28, 2016

It's rated for 14A on the 12V rail... it's a joke. I doubt it can even hold up to those standards. You need to replace it.

subhashr2k · Apr 28, 2016

turkey3_scratch :

really???? thats another 3500 out of the pocket!!

engineer5261 · Apr 28, 2016

turkey3_scratch :

engineer5261 :

Digital multimeters measure voltage. To calculate the power requirement of his computer, you just know stuff off the back of your head. For CPU and GPU, you look up professional reviews and see stress test power requirements of that hardware. RAM is negligible. Hard drives are about 10W each, SSDs much lower. Basically, it's primarily important to take into account the CPU and GPU, then add perhaps another 50W for the rest of the hardware.

But even then, it should be taken with a grain of salt, because the requirements of the specific rails matter more, as well as the fact that there are many 550W power supplies out there that can maintain stable voltages, not burn, and not shut off from protections when the power of the energy outputs is as high as 650W, whereas there are "750W" units out there that'll have unstable voltage or shut off by time the power of the energy outputs is 650W.

Your calculation assumes a LOT, e.g. "add perhaps another 50W for the rest of the hardware" and I do not believe that it is more accurate than online power supply calculators which use the manufacturer specification of the devices.

I still feel that OP should use an online psu calculator or go by the stated manufacturing specification (this will always be within tolerance, estimates off the top of your head will NOT be).

source: I have 2 degrees in electronics from IVY schools and I work as a designer for a major company.

sizzling · Apr 28, 2016

Yeah that so called 400w PSU is only giving 14Ax12v=168w on it's most important rail. While it might work it really is a bad unit, if it were to die it could damage other components. Personally I'd change it for a good quality unit

turkey3_scratch · Apr 28, 2016

engineer5261 :

For one thing, these calculators overexaggerate. Secondly, the exact wattage value is not important, just a generalization, which knowing stuff of the back of your head gives. Those calculators, though, don't usually take into account, for instance, the specific GPU model. And overclocking is not taken into account. Or they overexaggerate to overcompensate fir their crappy power supply units.

Also, since power supplies don't run out of power, as long as you purchase a power supply that maintains a stable voltage under the maximum load of the hardware, and if that maximum load is below the protection trigger points or burning possibilities of the power supply, you are good.

You're never going to get an exact wattage value for anything, but wattage is so unimportant when it comes to choosing a PSU anyway that once you have calculated in general the wattage requirement for the hardware, the PSU search process should be initialized by eliminating using rated wattage as a parameter of comparison. Only thing is that those calculators don't usually even give a general idea, sometimes they are far out.

Chayan4400 · Apr 28, 2016

engineer5261 :

turkey3_scratch :

Your calculation assumes a LOT, e.g. "add perhaps another 50W for the rest of the hardware" and I do not believe that it is more accurate than online power supply calculators which use the manufacturer specification of the devices.

I still feel that OP should use an online psu calculator or go by the stated manufacturing specification (this will always be within tolerance, estimates off the top of your head will NOT be).

source: I have 2 degrees in electronics from IVY schools and I work as a designer for a major company.

It is true that some online calculators get the wattage wrong, namely Outervision's calculator. It's core functionality may be fine, but due to the overwhelming number of options (Fans, optical bays, SSDs, etc) people tend to get confused and enter incorrect values which pads on quite alot to the final result. PCPartPicker's built-in calculator is the best. It's simple, intuitive and spot on.

If calculating manually, then the preferred method is generally the sum of the TDP of the CPU and GPU combined with 50W, as you said, for other power draws. By no means will it give an accurate value (margin of error should be around +-20W), but usually gives you enough of an idea about the projected power draw to buy a suitable PSU.

engineer5261 · Apr 28, 2016

Chayan4400 :

engineer5261 :

It is true that some online calculators get the wattage wrong, namely Outervision's calculator. It's core functionality may be fine, but due to the overwhelming number of options (Fans, optical bays, SSDs, etc) people tend to get confused and enter incorrect values which pads on quite alot to the final result. PCPartPicker's built-in calculator is the best. It's simple, intuitive and spot on.

If calculating manually, then the preferred method is generally the sum of the TDP of the CPU and GPU combined with 50W, as you said, for other power draws. By no means will it give an accurate value (margin of error should be around +-20W), but usually gives you enough of an idea about the projected power draw to buy a suitable PSU.

That seems to make more sense, and would be a good way for non-technical people to easily estimate their power draw

can my 400w power supply run gtx 750 ti?

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